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1 grade worksheets: mental arithmetic

Printable worksheets for free downloads: "Mental arithmetic from 1 to 20"



Mental arithmetic. Numbers from 1 to 5

Numeration

1. What number comes before 3?

2. What number comes before 2?

3. What number comes after 1?

4. What number comes before 4?

5. What number comes after 4?

6. What number comes before 3?

7. What number comes after 2?

8. What number comes before 5?


Addition

1. Add 3 to number 2. Write the answer.

2. Add 2 to number 2. Write the answer.

3. Add 1 to number 2. Write the answer.

4. Add 1 to number 4. Write the answer.

5. Add 1 to number 3. Write the answer.

6. Add 4 to number 1. Write the answer.


Subtraction

1. Subtract two from three. Write the answer.

2. Subtract two from two. Write the answer.

3. Subtract one from three. Write the answer.

4. Subtract one from two. Write the answer.

5. Subtract two from four. Write the answer.

6. Subtract one from four. Write the answer.


Previous or next numbers

1. What are the neighbors of numbers 3?

2. What are the neighbors of numbers 2?

3. What are the neighbors of numbers 4?


Make mental arithmetic:
1 + 1 = 1 + 2 = 1 + 3 = 1 + 4 =
2 + 1 = 2 + 2 = 2 + 3 = 3 + 1 =
3 + 2 = 4 + 1 =

Solve the problem
There are four flowers on the left branch. However, on the right branch there are two flowers less. How many flowers on the right branch?


Mental arithmetic, numbers from 1 to 10.

Numeration

1. What number comes after eight?

2. What number comes before seven?

3. What number comes after nine?

4. What number comes before five?

5. What number comes after seven?

6. What number comes before nine?

7. What number comes after six?

8. What number comes before four?


Addition

1. Add 5 to number 2. Tell the answer.

2. Add 6 to number 2. Tell the answer.

3. Add 7 to number 1. Tell the answer.

4. Add 8 to number 2. Tell the answer.

5. Add 9 to number 1. Tell the answer.

6. Add 6 to number 1. Tell the answer.


Subtraction

1. Subtract 2 from 9.

2. Subtract 2 from 8.

3. Subtract 2 from 7.

4. Subtract 1 from 6.

5. Subtract 1 from 5.

6. Subtract 1 from 4.


Previous or next digits

1. Name the neighbors for number six.

2. Name the neighbors for number eight.

3. Name the neighbors for number seven.


Make mental arithmetic:
5 + 1 = 6 + 2 = 7 + 3 = 4 + 4 =
6 + 1 = 5 + 2 = 6 + 3 = 5 + 1 =
4 + 2 = 5 + 1 = 4 + 4 = 5 + 3 =

Solve the problem
Kate has 3 nuts in the left hand, and she has 2 nuts on the other hand. How many nuts has she in both hands?


Mental arithmetic from 10 to 20

Numeration

1. What number comes after eighteen?

2. What number comes before seventeen?

3. What number comes after nineteen?

4. What number comes after fifteen?

5. What number comes after seventeen?

6. What number comes before nineteen?

7. What number comes after sixteen?

8. What number comes before sixteen?


Addition

1. Add 16 to number 4. Tell the answer.

2. Add 15 to number 3. Tell the answer.

3. Add 17 to number 2. Tell the answer.

4. Add 18 to number 2. Tell the answer.

5. Add 19 to number 1. Tell the answer.

6. Add 16 to number 1. Tell the answer.


Subtraction

1. Subtract 4 from 19.

2. Subtract 5 from 18.

3. Subtract 7 from 17.

4. Subtract 5 from 16.

5. Subtract 8 from 15.

6. Subtract 2 from 14.


Previous or next digits

1. Name the neighbors of number nineteen.

2. Name the neighbors of number eighteen.

3. Name the neighbors of number fifteen.


Make mental arithmetic:
5 + 11 = 6 + 12 = 7 + 13 = 14 + 4 =
6 + 11 = 5 + 13 = 6 + 13 = 4 + 11 =
14 + 2 = 15 + 1 = 14 + 4 = 15 + 3 =


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